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| Characteristics of heavy metals foliar uptake by maize (Zea mays L.) exposed to dustfall with different particle sizes |
| Received:September 27, 2024 |
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| KeyWord:dustfall;contaminant transport;mining area;heavy metal enrichment |
| Author Name | Affiliation | E-mail | | QIAN Xiangyu | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Qiqi | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Dantong | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | QI Hao | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Huafen | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WAN Yanan | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Qi | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | ZHUANG Zhong | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | zhuangzhong@cau.edu.cn |
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| Abstract: |
| To investigate how the particle size affects the absorption of heavy metals by crop leaves, we conducted an exposure experiment on maize leaves by simulating atmospheric dustfall from mining-area soil to analyze the effects of particle sizes on growth, and heavy metals accumulation in maize seedlings. The results showed that at the early stage of maize growth, small particles significantly inhibited maize plant height and aboveground biomass. Additionally, under the exposure treatment of large particle size（＜2 mm）, maize leaves had the highest retention rate of heavy metals in particulate matter. The contents of cadmium（Cd）, arsenic（As）, lead（Pb）, zinc（Zn）and copper （Cu）in the aboveground parts of maize treated with dustfall were 4.05-4.65, 13.42-33.58, 11.05-19.61, 2.50-4.12 times and 1.19-1.44 times higher than those of the control, respectively. Heavy metals in atmospheric particulate matter can be transferred from old leaves to new leaves after being absorbed by maize. The contents of Cd, As, Pb, Zn and Cu derived from atmospheric particulate matter in the new leaves were 1.20, 1.53, 1.11, 1.11 times and 0.56 times higher than those in the old leaves. Moreover, scanning electron microscope observations revealed that particles containing heavy metals tend to gather around the stomata of maize leaves, further confirming that maize can uptake heavy metals by intercepting atmospheric particulates on leaves. This study suggests that the particle size significantly affects the interception and adsorption of particulate matter and the absorption of heavy metals by corn leaves. |
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